Forming and pricking sand molds for castings.



A. E. ARCHfR; FORMING AND PRICKING-SAND MOLDS FOR CASTINGS.

APPLICATION FILED DEC. 27. I917.

Patented Apr. 8,1919.

2 SHEETS-SHEET 1.

O v V I Q46 ATTY rue' .lolms Prrtni cm. "Jam-undo. wunmcwu. n n

A. E. AREIH ER. FORMING AND PRICKJNG SAND MOLD S F08 CASTINGS.

APPLICATION FILED DEC- 21.1817.

Patented Apr." 8,

2 SHEETS-SHEET 2- m Pm; cw

' UNITED FORMING AND PitIcKING, SAND 'MOi-IDS or, cnsrrncs. V

To all whom it may concern: I

Be it known that I, A'R'rrnm EnwARn; ARCHER, a subject of the King of Great Britain,whose post-office addressis Fulwith Grange, near -Harrogate, in the-- county of York, England, Great Britain, have "invented new and useful Improvements in, Forming and Pricki'ng Sand Molds forOastings. This invention relates to improvements in l the method of and in means for the forma-z tion and pricking of sand molds or cakes for the production of metal castings carrying a slender part or parts such for instance as points, spikes, shanks, prongs or lugs pro jecting therefrom, the pricking being forthe purpose of forming perforations in the; molds orcakes into which the molten metal flows to produce the points or the like ofthe castings; and the objects-oflthe said invention'are, (a) to insure the pricln'ngbeingae-.v curately eflected, (b) to dispense withthe practice hitherto existing of forcing the prickers into the sand after it; has; been rammed into a compact and more or less rigid mass (ale. after the mold, has been" formed) which has the prejudicial effect of bringing the sand into a condition of in creased density at precisely those positions (2'. e. around the perforations formed by the, prickers) where it is an advantage thatit should be softer'in order to permit the steam I and gas attendant up'on'the inflow ofthe molten'metal to escape, (0) to enablethe mold to be formed simultaneously with thee pricking theroef, thus, saving timeand labor" 1 due to one operation instead of two "as here-f tofore arising outof separately forming-the mold and separately pricking itand' (d) to reduce the friction set up by the-passage or" the prickers into the hard sand which causes their rapid deterioration :and renders: fre-' quent replacement necessary." I

For the purpose of my invention I employ and combine with my meansso much ofsthc device known in the art as a springpricker as consists of a series of 'prick'ers. secured-ini means; The base 1 is bored at suitable posi tions thereof+in the exampleillustratedin ,the 'drawings adjacent to the four corners I asat 6to' 1id'ing1y recei e rods suc l a v '63 a plate which has had such moyement relatively to another plate (to' which it is at-q tached) as to cause the prickersto be pro-- jected through perforations in the latter j Sp e cification'of Letters Patent. Patented: AI Application file d'December 27, 1917; Serial 0. 209,039. z y;

mold not such ing drawingsin whichz 7 a. c 'Figurel -isside elevation of the-entire a 7 v ,ucs

1 plate; and in which the free ends of the prickv ers normally rest which.saidlatterfplate has been mainly composed ofja ,repl-icaor reiplicas of rthe-v pattern or cpatter'ns l 'tfrom 'i e which pattern or patterns the mold .0 C ke had already been formed) for thefpurpose. 01; H

registering'the replica: or rep1icaswithh patternbrpatterns in th eration of" pricking such mold.

- I attain the ob'ects[abovereferred the mechanism illustrated in the accomplany J paratus." r

(f Fig. 2, is endelevation of same. f- 3; a

Fig. '3-is top plan viewc;

Fig. 4 isplan View of g after referred: to viewed "from the underside to a larger scaleand,

Fig. 6 is sideelevation of thei -apparatus with pattern plate depressed I as hereinafter referred to.

Fig. 7 is. a detail vi w showi ng'insideele r vation a partof'the pattern plate, and Fig. ":8jissa View showing'the: undersideofz the ,3

same-part. t

:Fig. 9 isa detenvationone'offthesliding rods.-

few showing infside' as base, -plateiherein 5 ,"Fig, 5 is, side elevation of ,prickers, with u pattern plate;hereinafter'referred drawn 2 is? f grally withfthepattern, plate 23nd ar '36:. arranged in the pattern plate that there shall be a plain margin surrounding the pattern b x or aggregation of patterns to accommodate a A the half section ofa .moldingboxb of any, 5 ordinary type and which maybe held infpor;

sition on thepattern plate2 byanyl suitable 9" which rods are rigidly secured to the pattern plate 2 as indicated at 10, 11,. 12.

The borings 6 in the base. 1 are preferably somewhat larger in diameter than the diameter of the rods so that the said rods have a latitude of transverse movementin the said borings. A preferred method of securing the rods to the pattern plate consists in such rods being each formed with the flange part 13 which flange parts fit into recesses 14 in the underside of the;pattern plate 2 the said pattern plate being'bored through and the rods drilled and screw threaded to receive thescrew studs 15. It is to loeunderstood that the pattern plate 2 has a reciprocating movement relatively to the base'l. Interposed between the base 1 and the pattern plate 2 and positioned on each of the sliding rods are 'coil springs 16 or other suitable springs to flexibly hold the pattern plate 2 normally away from the base 1 and to return I the pattern plate 2 to normal position after the pattern plate has been depressed aswill hereafter appear. The sliding rods and the pattern plate 2 are held in .the basel by means. of the nuts 7, 8, 9 and 9', one of the said nuts-in'each case serving to adjust the pattern plate 2 into correct position relatively to the'prickers 3 and at the sametime to bring the springs 16 into a condition of compression.

In Fig. 3 is shown the outer face of the pattern plate 2 bearing examples of the patterns 17 are perforations formed in the pattern plate 2 in such positions that they are embraced by the actual patterns. As

shown by Fig. 1 the free ends of the prickers 3 are normally housed in the perforations in the pattern plate 2 ,and which plate slides on the prickers whose ends normally are flush or approximately flush with the outer face of the pattern plate 2, but which ends when the pattern plate 2. is depressed as shown by Fig. 6 project beyond such plate;

smethod of holding together and 111 POSltlOll an assemblage of prickers which method is preferably adoptedfor the purpose of my invention, 18 being a plate preferably ,of metal and 19 being another plate perforated at desired positions in order to pass the prickers.therethrough, While the heads of the prickers are interposed between the plates. As clearly shown, the plate 18' is secured to the base plate 1 by means of studs 24 and nuts 25; 20 are distance pieces by means of which a space between the two plates is preserved for theaccommodation of the heads of the prickers. The plates 18 and 19 areheld togetherat suitable posi tions as indicated at 2 1. 22 are rods (of which there may befour or more) such rods being rigidly secured at one end tothe pattern plate 2 the said rods sliding in perfora- 5 illustrates the hitherto known tions formed for the purpose in the plates 18 and 19, the position of the plates 18 and 19 relatively to the pattern plate 2 being adjusted by means of nuts such as 23 which likewise prevent the plates 18 and 19 be coming separated from the pattern plate 2.

The rods 22 may in some cases as will herein:

after appear be dispensed with but if employed the base 1 is so perforated as to permit the movement of the rods 22 as will be clearly understood.

In order that the depth of the pricking of the mold may be regulated or varied to any desired degree I provide means whereby the pattern plate 2 may be depressed to a less or larger extent thus enabling a corresponding lesser or larger extent of projection of the prickers through the pattern plate 2. Such means may consist of a suitable number of studs 26 arranged in the base 1 at any desired position thereof, such studs screwing into the base. By rotating the studs 26 which may be effected by a tool inserted in the slot 27 the heads or free ends of the studs may be brought'closer to or removed farther from the base 1, it being understood that the patternplate 2 contacts by way of example.

In those cases where my means are employed for invariably producing molds from the one pattern or sets of the one pattern thus not necessitating the variation of the pattern plate 2 I dispense with the rods 22 inasmuch as when the device is once set up it may remain wholly intact. When, however,'the use of a partlcular plate carrying a given pattern or patterns is not constant pattern plate and prickers may be interchangeable. In such cases the rods 22 are preferably employed to hold the prickers and the pattern plate when detached from the base intact until again required.

The operation is as follows The half section of a molding boX (of any ordinary description) is placed on the pattern plate 2 and is filled with sand and such or only intermittent the particular pattern plate and the particular prickers with their sand is rammed or squeezed'byi any suitable means, which means may be operated either? manually or by power. "The pressure: set up by the rannning or squeezing causes the pat-i tern plate and with ittheimolding box "and sand to move toward the base and the p'ricle ers to be protruded through the pattern plate into the sand. Thus the mold in-the operation of being formed is at the same time pricked. i

The base above referred to may take the 1 form of a table or bench and in the latter case several pattern plates and sets of prick ers and other parts above described accessory to such pattern and base plates may be arranged or mounted as described in reference to a base plate directly on such bench,

which accordingly would operate as a base common to the several pattern plates'and accessory or co-acting parts, and it is to be understood that the table or bench is in cluded in the term base plate, wherever such term is hereinemployed.

I lay no claim to the'pricking device as above described asbeing composed offthe parts 3, 18, 19, 20, 21, 22, 23, or to the ar rangement of such parts as such device is known, but what I do claim is 1. The method of forming and pricking sand molds or cakes for the production of metal castings, consisting of the employment of a pattern or patterns in two parts, one,

part thereof relatively to the other" being flexibly supported and such other part stationary, the moving pattern part (with av half molding box and sand thereon- 4min together during the formation of the mold) continuously moved in one direction against the supporting influence by the action of ramming the sand to formthe mold and continuously returned to the normal position by the supporting influence on the reverse move mentr-of the ramming means, and by which movements, in one direction, the stationary pattern parts are causedto project through apertures provided in the flexibly supported part into the sand toform cavities in the said,

sand mold to receive molten metalfor the formation of part of the casting, the mold being withdrawn from the stationary parton the reverse movement of the ported part.

flexibly sup- 2. In means for the formation and prick ing of sand molds or cakes for the production of metal castings, thecombination of a flexibly supported perforated platefpatterns carried by said plate from which the mold is to be formed, and-stationary means for pricking the sandmolds in said patterns to provide cavities therein to receive molten metal for the formation of part of theoasting, said means operating throughthe perforated plate and co-acting with said plate to form the equivalentof a single pattern.

1 i 31. Means for of sand'mold s or cakes forthe p'roduction zof liefform aition' andpri'cking;

metalcastings'consisting 0f thecombination with'a series of prickers :ofga plate carrying :a pattern or patterns from whichlthe mold is tobe 'formedand a base;plate, the saidpat tern plate being adapted to support a m'oldi-ng bQ-Xgjsuch pattern-plate being so mounted in thelbase plate as'to have a reciprocating Which base plate the prickers'aresecured, the

forati'ons in which the, free parts of the pr1ckpricke'rs project beyond the pattern, plateon the movement in one direction of the pattern movement relativelyto the base plateand to 7 5 said pattern plate being provided with err ers are" normally contained and, through Whichperforations such; free parts of the 1 plate and sand during the formation of the i mold or cake, such prickersoccupying their a normal position on thereverse movement of the pattern plate and-sand.

, t 4:. Meansfor the formation and pricking. of sand molds or cakes for. v the production of metal castings consisting of the combination a pattern orpatterns from which the mold is to be formed and a base plate,the said patwith a series of prickers ofa plate carrying r tern plate being adapted to support a mold-, 1

g .which perforations suchfree partsof the prickers projectbeyond the pattern plate on the movement in tern plate and sand duringtheformation of e the mold or cake, such prickers occupying their normal position on the reversegmovement of the "pattern plate and" sand and means whereby the extent of projectionof the prickers throughthe pattern plate may be regulated;

comprising a stationary base, pr cking memone direction of the pat- 5. An'fapparatus "for formingsand molds,

gobers fixed to and upstandingfrom'said base,

a; pattern plate mounted :for A reciprocating movement above sa d base lngs therem to receive the pricking members,

able. therewith. i v 6. apparatus for forming sand molds,

comprisinga stationary base, pricking mem- V bers fix ed to and upstanding from said base,

movement above said base and having open ings thereinvto receive the pricking members, a

i a mold above the pattern plate and movable "therewith, and means for adjusting the movement'ofthe pattern plate toward the base.

and having open;

.115 and a moldabove the pattern plate and m'ov- 71:20 a pattern plate mounted for reciprocating,

An apparatus for forming molds ,comy prising a stationary'base, pricking members.

upstanding from and fixed t0 the base, a patin said base, and springs surrounding the tern plate above the base formed With openbolts and interposed between said plate and 1) lngs t0 I'GCBIVGI'thB pricking members, means base.

for biasing said late away from said base i 5 and amolding by supported by said plate: ARTHUR EDWARD ARCHER v 8. -An apparatus for forming molds, as em- Witnesses:

bodied in Claim 7 said biasing means com- ERNEST FISHER,

prising bolts fixed .to said plate and slidable EDWARD IBBETSON.

I Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents,

f Washington, D. G. 

